Security descriptor argument for ITaskFolder::CreateFolder method

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MFC

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VisualC++

I'm trying to create a folder in Task Scheduler under the root folder using ITaskFolder::CreateFolder method.

I'm wondering what is the security descriptor argument for this method? So far I can't figure out any security variant for this argument.

Searching on msdn I found Security Descriptor and tried the following code,

VARIANT v;
V_VT(&v) = VT_BSTR;
V_BSTR(&v) = SysAllocString(L"O:WDG:WD");

the function fails and returns E_INVALIDARG.

Please help me with this problem.